Calipers



April 7, 1925.

c. LwBAUSCH ET AI.

CALIPERS Filed Jn. 14, 1921v R 3 V W m m H T w nm .r a & v we Patented Apr. 7, 1925. I

UNITED STATES PATENT OFFICE.

CARL L. BAUSCH AND EDWIN HART, ROCHESTER, NEW YORK, ASSIGNOBS TO BAUSCE dc LOMB OPTICAL COMPANY, OF BDCHESTEB, NEW YORK, A CORPORA- TION' on NEW Yoax.

Y .cnmrnns Appllcation filed January 14, 1921. Serial No. 437,335.

Be it known that we, Cam. L. BAUSCH and each preferably formed of a strip of sheet EDWIN HART, of Rochester, in the county of metal folded upon itself as at 12, so that Monroe and State of New York, havein each member has a substantially U-shaped vented certain new and useful Improvements cross section aifording a strong and conin Calipers; and we do hereby declare the venient form of construction. The member 60 following to be a full, clear, and exact deis provided intermediate its ends with scription of the same, reference being had to a pair of opposite spaced ears 13, and the the accompanying drawings, forming apart member 11 with asimilar pair of cars 14' 10 of this specification, and to the reference which embrace the cars 13. The latter have This invention has to do with measuring duced ends 16 of a bronze bushing 17 having, instruments and relates more particularly to one of its ends slabbed off as at 18 for the variety of such instruments adapted for cooperation with a flattened side 19 of the measuring the distance between two parts opening in one of the cars 13, so that the or surfaces of an object "and commonly latter carry the bushing in a manner pre- 70 known as calipers, the chief object of. the venting its rotation therein. The bushiteifi invention being to provide a practical, acand the cars 14 of member 11 are provid curate, economical, and convenient instruwith bearing openin' which receive and 20 ment of the above character. To these and closely fit a plvot bo t 20 provided at one other ends the invention consists in certain end with a slotted head 21 and at the other 75 improvements and combination of parts, with a threaded portion receiving a nut by d all as will be hereinafter more fully demeans of which the bo lt 1s securedmpositionscribed, the novel features being pointed out and maintains the various parts described 2 in the claims at the end of the specification. in proper relatlon. As apparent from thls In the drawings: construction, bolt 20 is clamped immovably 80 Figure 1 is a side elevation of a calipers in ears 14 and the pivotal movement ofmem embodying the present invention. hers 10 and 11 is obtained by ID1321171011. of Figure 2 is an elevation of the same as the bronze bushing on the bolt. A spring so seen from the left of Figure 1. 1 p 23 is preferably colled one or more times Figure 3 is a sectional view on the line about the bushing 17 between cars 13 of 85 33 of Figure 1. v member 10 with its ends extended for slid- Figure 4 is a fragmentary view as-seen 'ingengagement with the inner surfaces of from the line 4 -4 of Figure 1. members-10 and 11, to normally urge the Figure 5 is a fragmentary sectional view contact parts hereafter described towa as seen from the line 5*-5" of Figure 3, and each other. 90 Figure 6 is a similar view on the line The members 10 and 11 have inserted and 6-6* of Figure 2.- fixed in adjacent ends thereof, on oneside Similar reference characters throughout of the pivot, preferably, bars 24 formed at the several views indicatethe same parts. their outer ends withhearing sleeves 25 for disclosure herein is intended merely by spindles 26 forming ahgned contact parts wagof illustration of the principles involved projecting toward each other so as to 0111 an of a preferred practical application engagement in the normal position of the thereof, and is capable of various modificamembers 10 and 11. The parts 26 are thus tions within the spirit of the invention. This supported by means facilitating adjustment 100 embodiment is of the t. pe known in the art if desired and are secured in position, 111 'p as shear-calipers, comprising pivotally consleeves 25 by means of lock nuts 27 nected members provided with opposed con- Member 11 is pr ferably bifurcated at the tact arts and means for indicating a dimenend opposite itscontact part with its forked sion included between the contacts. portions 28 embracing a scale part or plate 1 Referrin to the drawings and first to 29 which is fixed to the member in any suit- Fi re 1, t ere is shown a pair of members able manner, as b spot weldmg, or riveting, 10 and. 11. movably, connected in .noninterras 0.12.30. The sea e' plate 29 is formed. on the To all whom it may concern: secting or substantially. parallel-=relatidn, 66

numerals marked thereon. openings 15 therein which receive the re- I The embodiment of the invention selected with which are threadedly engaged studs or 33 of member 10 nipulation of the arc of a circle concentric with the pivot 20 of members 10 and 11 and is graduated into equal units by division lines 31 marked in the present instance from zero to 12 to represent in millimeters the distance between the contacts 26. r

embrace and move over the scale during relative pivotal movement of the members, and this end 32 of member 10 is preferably formed on its inner side adjacent the scale with a part or straight surface 33' extending in a direction eccentric to the pivot 20, or in other words obliquely or at an inclination with scale surface 33 yisions 31 intercepted between adjacent diof scale 29 is preferably divided -mto ten parts marked with the units zero to 10, formlng micrometer indicia or a scale 34 for indicating fractional parts or tenths,

of the unit graduations on the main scale. Scale plate 29 carriesa stop lug 35 for limiting engagement with the crotch of the bifurcated end of member 10.

It is apparent from the above description of the construction that members 10 and 11 may be conveniently gripped in the hand an pressed toward each other to separate contacts 26 which may be allowed to close under the action of spring 23 into contact with tween which is to be determined. The contacts are thus engaged with objects to be measured with a substantially uniform spring pressure which also tends to maintain the contacts in close engagement with an object, thereby facilitating accurate mainstrument in use. By contacts, the oblique end is moved over the main scale 29 and the zero point of the micrometer scale 34 moves over the graduations of the main scale thereby indicating on the latter the approximate dimension to be desuch setting of the 29. That portion of the obliquean object the distanceends together, 2.

termined, while the dimension ismore particularly or precisely shownby the micrometer scale which indicates at the point where it is intercepted by the division line of scale 29 the fractional mam scale to give the correct reading.

apparent from the description and drawings, the construction is simple and economical to manufacture, comprising but a few parts, which are rigid and durable in character so that there islittle likelihood of derangement of the parts in use. The calipers is therefore accurate within the degree of precision for which it is intended and the construction and arrangement of the parts provides an instrument which is not only convenient to manipulate in use but in which the unit and fractional indications are both made at the same time in.a conveniently legible manner.

We claim as our invention:

Calipers comprising a pair of members each formed of a strip of sheet metal folded upon itself to provide a substantially U- shaped cross section, means pivotally connecting said members intermediate their ends in'substantially parallel, relation, said members having the opposing ends thereof on one side of the pivot adapted for contact with opposite sides of an object to be meas ured, a spring tending to move said contact part carried by one of said members on the opposite side of the pivot provided with a main scale arranged in an arc concentric with said pivot and graduated in suitable tion on the other member bifurcated to slidably embrace opposite sides of said scale part and provided with a scale arranged obliquely to said main scale for movement thereover to indicate in fractions of a unit of said main scale.

CARL L. BAUSGHJ EDWIN HART.

part or number of tenths a; to be added to the units indicated on the The end 32 of member 10 adjacent the main scale 29 is preferably bifurcated to units, and an. opposing end por- 

